Human Comfort Analysis In Across-wind Direction For Prefabricated Steel Frame Structure With Inclined Support Joints

A large number of tests and measured data has indicated that, dynamic responseto across-wind of tall buildings is usually larger than the response to the along-wind.Civil engineering has paid much attention to the research on aross-wind response.Compared with the traditional high-rise concrete structures, the dynamic responseunder wind load of high-rise steel structure buildings is stronger. As a new form offrame structure, the prefabricated steel frame structure with inclined support jointshas been applied to practical engineering.Besides safety and economy, wind-inducedresponse comfort problems should also be considered in the design of modernhigh-rise building design.Based on the above background, this thesis mainly conducts the researches asfollows:Firstly, this thesis makes a summary of the prefabricated steel frame structureand introduces the prefabricated steel frame structure with inclined support joints.Secondly, it describes the characteristics and formulation mechanism ofacross-wind load, and introduces the influence of wind on the structure from bothstatic and dynamic. And then it elaborates the theory of frequency domain analysisand time domain analysis which are the two computational method of wind load.Based on random vibration theory, this thesis derives the response of across-wind loadon the structure.Thirdly, it describes the simulation method and implementation process of fluc-tuating wind load. In terms of mutual power spectrum matrix, the thesis simulatesaross-wind time history at different heights of the structure by using trigonometricseries harmonic superposition method, and writes the simulation program of fluctu-ating wind with MATLAB. Numerical simulation results indicate that the simulatedspectrum is good agreement with the target spectrum of wind spectrum the targetspectrum of wind spectrum. Thus, it can be used for wind-induced structural responseanalysis.Fourthly, based on the reasonable assumptions of the prefabricated steel framestructure with inclined support joints, a finite element analysis model was buildedwith structural analysis software Sap2000. According to dynamic analysis under theacross-wind load history curve, the mold state information and acceleration response time history of the steel structure are carried out. On the basis of formula in loadcodes of different countries, the thesis calculates the acceleration of the steel structurein across-wind direction, and then analyses the reason for the differences in the resultsof these methods. In addition, based on the finite element analysis model, the contri-bution of the higher modes to the acceleration was calculated and it should be con-sidered in the design progress of high-rise steel structure.Finally, the thesis introduces the criteria and methods of comfort evaluation bothhome and abroad. According to the comfort criteria, it calculates the comfort of thesteel structure. Intends to improve the wind-induced comfort, viscous dampers areused to control the vibration. Then, the dynamic and time-historical analysis of thesteel structure is conducted by using viscous damper unit of Sap2000. The results in-dicate that the strategy of vibration control adopted in this thesis can significantlyimprove the human comfort of the structure.